Among the following, the number of halide(s) which is /are inert to hydrolysis is ___

Among carbon group, ccl4 doesn’t hydrolyse remaining chlorides are tends to hydrolyse.SF6 is more stable, due to steric reasons therefore doesn’t tend to hydrolyse.5th group, PCl5+H2O→POCl3+2HClPOCl3+3H2O→H3PO4+3HClBF3 is inert due to the concept of Back bonding.